Reset FI CO transactional data

All -

We recently built a production box from a sister company refresh.

We now have a production box with two company codes configured, one company code with transactional data (irrelevant for this golive). One company code to go live with (no transactional yet).

We are looking to delete the transactional data for the non - relevant company code 11 days before go-live using SPRO (Reset Transactional Data)

I hear horror stories

Thanks!